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[ci skip] Move chunk system patch back

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This commit is contained in:
Nassim Jahnke
2024-01-24 22:13:08 +01:00
parent 49feea0525
commit 52438f04a0
19 changed files with 317 additions and 551 deletions
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342
patches/server/MC-Utils.patch
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@@ -2762,7 +2762,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+ };
+
+ final ChunkHolder holder = level.chunkSource.chunkMap.getUpdatingChunkIfPresent(CoordinateUtils.getChunkKey(chunkX, chunkZ));
+ final ChunkHolder holder = level.chunkSource.chunkMap.updatingChunkMap.get(CoordinateUtils.getChunkKey(chunkX, chunkZ));
+
+ if (holder == null || holder.getTicketLevel() > minLevel) {
+ loadCallback.accept(null);
@@ -2790,7 +2790,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ public static void scheduleTickingState(final ServerLevel level, final int chunkX, final int chunkZ,
+ final FullChunkStatus toStatus, final boolean addTicket,
+ final PrioritisedExecutor.Priority priority, final Consumer<LevelChunk> onComplete) {
+ if (toStatus == ChunkHolder.FullChunkStatus.INACCESSIBLE) {
+ // This method goes unused until the chunk system rewrite
+ if (toStatus == FullChunkStatus.INACCESSIBLE) {
+ throw new IllegalArgumentException("Cannot wait for INACCESSIBLE status");
+ }
+
@@ -2829,7 +2830,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+ };
+
+ final ChunkHolder holder = level.chunkSource.chunkMap.getUpdatingChunkIfPresent(CoordinateUtils.getChunkKey(chunkX, chunkZ));
+ final ChunkHolder holder = level.chunkSource.chunkMap.updatingChunkMap.get(CoordinateUtils.getChunkKey(chunkX, chunkZ));
+
+ if (holder == null || holder.getTicketLevel() > minLevel) {
+ loadCallback.accept(null);
@@ -2838,11 +2839,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+
+ final CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> tickingState;
+ switch (toStatus) {
+ case BORDER: {
+ case FULL: {
+ tickingState = holder.getFullChunkFuture();
+ break;
+ }
+ case TICKING: {
+ case BLOCK_TICKING: {
+ tickingState = holder.getTickingChunkFuture();
+ break;
+ }
@@ -2942,19 +2943,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+
+ public static int getLoadViewDistance(final ServerPlayer player) {
+ final ServerLevel level = player.getLevel();
+ final ServerLevel level = player.serverLevel();
+ if (level == null) {
+ return Bukkit.getViewDistance() + 1;
+ return Bukkit.getViewDistance();
+ }
+ return level.chunkSource.chunkMap.getEffectiveViewDistance() + 1;
+ return level.chunkSource.chunkMap.getPlayerViewDistance(player);
+ }
+
+ public static int getTickViewDistance(final ServerPlayer player) {
+ final ServerLevel level = player.getLevel();
+ final ServerLevel level = player.serverLevel();
+ if (level == null) {
+ return Bukkit.getSimulationDistance();
+ }
+ return level.chunkSource.chunkMap.distanceManager.getSimulationDistance();
+ return level.chunkSource.chunkMap.distanceManager.simulationDistance;
+ }
+
+ private ChunkSystem() {
@@ -6420,18 +6421,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ this.regionManagers.add(this.dataRegionManager);
+ this.nearbyPlayers = new io.papermc.paper.util.player.NearbyPlayers(this.level);
+ // Paper end
}
+ }
+
+ // Paper start
+ // always use accessor, so folia can override
+ public final io.papermc.paper.util.player.NearbyPlayers getNearbyPlayers() {
+ return this.nearbyPlayers;
+ }
}
+ // Paper end
+
protected ChunkGenerator generator() {
return this.generator;
}
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
});
}
@@ -6443,22 +6443,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
private static double euclideanDistanceSquared(ChunkPos pos, Entity entity) {
double d0 = (double) SectionPos.sectionToBlockCoord(pos.x, 8);
double d1 = (double) SectionPos.sectionToBlockCoord(pos.z, 8);
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
}
+ // Paper start
+ public final int getEffectiveViewDistance() {
+ // TODO this needs to be checked on update
+ // Mojang currently sets it to +1 of the configured view distance. So subtract one to get the one we really want.
+ //TODO check if +0 is correct now
+ return this.viewDistance;
+ }
+ // Paper end
+
private CompletableFuture<Either<List<ChunkAccess>, ChunkHolder.ChunkLoadingFailure>> getChunkRangeFuture(ChunkHolder centerChunk, int margin, IntFunction<ChunkStatus> distanceToStatus) {
if (margin == 0) {
ChunkStatus chunkstatus = (ChunkStatus) distanceToStatus.apply(0);
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
};
@@ -6554,6 +6538,24 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
}
};
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
}
- protected void setServerViewDistance(int watchDistance) {
+ public void setServerViewDistance(int watchDistance) { // Paper - public
int j = Mth.clamp(watchDistance, 2, 32);
if (j != this.serverViewDistance) {
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
- int getPlayerViewDistance(ServerPlayer player) {
+ public int getPlayerViewDistance(ServerPlayer player) { // Paper - public
return Mth.clamp(player.requestedViewDistance(), 2, this.serverViewDistance);
}
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
@@ -6613,7 +6615,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
private void updateChunkTracking(ServerPlayer player) {
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
private class ChunkDistanceManager extends DistanceManager {
});
}
- private class ChunkDistanceManager extends DistanceManager {
+ public class ChunkDistanceManager extends DistanceManager { // Paper - public
protected ChunkDistanceManager(Executor workerExecutor, Executor mainThreadExecutor) {
- super(workerExecutor, mainThreadExecutor);
@@ -6644,19 +6650,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
}
protected void purgeStaleTickets() {
@@ -0,0 +0,0 @@ public abstract class DistanceManager {
this.playerTicketManager.updateViewDistance(viewDistance);
}
+ // Paper start
+ public int getSimulationDistance() {
+ return this.simulationDistance;
+ }
+ // Paper end
+
public void updateSimulationDistance(int simulationDistance) {
if (simulationDistance != this.simulationDistance) {
this.simulationDistance = simulationDistance;
@@ -0,0 +0,0 @@ public abstract class DistanceManager {
}
@@ -6683,11 +6676,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
@VisibleForDebug
private NaturalSpawner.SpawnState lastSpawnState;
+ // Paper start
+ public final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<LevelChunk> tickingChunks = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(4096, 0.75f, 4096, 0.15, true);
+ public final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<LevelChunk> entityTickingChunks = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(4096, 0.75f, 4096, 0.15, true);
+ final com.destroystokyo.paper.util.concurrent.WeakSeqLock loadedChunkMapSeqLock = new com.destroystokyo.paper.util.concurrent.WeakSeqLock();
+ final it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<LevelChunk> loadedChunkMap = new it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<>(8192, 0.5f);
+
+ long chunkFutureAwaitCounter;
+ private final LevelChunk[] lastLoadedChunks = new LevelChunk[4 * 4];
+
+ // Paper end
public ServerChunkCache(ServerLevel world, LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, StructureTemplateManager structureTemplateManager, Executor workerExecutor, ChunkGenerator chunkGenerator, int viewDistance, int simulationDistance, boolean dsync, ChunkProgressListener worldGenerationProgressListener, ChunkStatusUpdateListener chunkStatusChangeListener, Supplier<DimensionDataStorage> persistentStateManagerFactory) {
this.level = world;
@@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
return chunk.getFullChunkNow() != null;
}
// CraftBukkit end
+ // Paper start
+ private static int getChunkCacheKey(int x, int z) {
+ return x & 3 | ((z & 3) << 2);
+ }
@@ -6745,119 +6748,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ return this.loadedChunkMap.get(ChunkPos.asLong(x, z));
+ }
+
+ public final LevelChunk getChunkAtMainThread(int x, int z) {
+ LevelChunk ret = this.getChunkAtIfLoadedMainThread(x, z);
+ if (ret != null) {
+ return ret;
+ }
+ return (LevelChunk)this.getChunk(x, z, ChunkStatus.FULL, true);
+ }
+
+ long chunkFutureAwaitCounter; // Paper - private -> package private
+
+ public void getEntityTickingChunkAsync(int x, int z, java.util.function.Consumer<LevelChunk> onLoad) {
+ io.papermc.paper.chunk.system.ChunkSystem.scheduleTickingState(
+ this.level, x, z, FullChunkStatus.ENTITY_TICKING, true,
+ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, onLoad
+ );
+ }
+
+ public void getTickingChunkAsync(int x, int z, java.util.function.Consumer<LevelChunk> onLoad) {
+ io.papermc.paper.chunk.system.ChunkSystem.scheduleTickingState(
+ this.level, x, z, FullChunkStatus.BLOCK_TICKING, true,
+ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, onLoad
+ );
+ }
+
+ public void getFullChunkAsync(int x, int z, java.util.function.Consumer<LevelChunk> onLoad) {
+ io.papermc.paper.chunk.system.ChunkSystem.scheduleTickingState(
+ this.level, x, z, FullChunkStatus.FULL, true,
+ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, onLoad
+ );
+ }
+
+ void chunkLoadAccept(int chunkX, int chunkZ, ChunkAccess chunk, java.util.function.Consumer<ChunkAccess> consumer) {
+ try {
+ consumer.accept(chunk);
+ } catch (Throwable throwable) {
+ if (throwable instanceof ThreadDeath) {
+ throw (ThreadDeath)throwable;
+ }
+ LOGGER.error("Load callback for chunk " + chunkX + "," + chunkZ + " in world '" + this.level.getWorld().getName() + "' threw an exception", throwable);
+ }
+ }
+
+ void getChunkAtAsynchronously(int chunkX, int chunkZ, int ticketLevel,
+ java.util.function.Consumer<ChunkAccess> consumer) {
+ if (ticketLevel <= 33) {
+ this.getFullChunkAsync(chunkX, chunkZ, (java.util.function.Consumer)consumer);
+ return;
+ }
+
+ io.papermc.paper.chunk.system.ChunkSystem.scheduleChunkLoad(
+ this.level, chunkX, chunkZ, ChunkHolder.getStatus(ticketLevel), true,
+ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, consumer
+ );
+ }
+
+
+ public final void getChunkAtAsynchronously(int chunkX, int chunkZ, ChunkStatus status, boolean gen, boolean allowSubTicketLevel, java.util.function.Consumer<ChunkAccess> onLoad) {
+ // try to fire sync
+ int chunkStatusTicketLevel = 33 + ChunkStatus.getDistance(status);
+ ChunkHolder playerChunk = this.chunkMap.getUpdatingChunkIfPresent(io.papermc.paper.util.CoordinateUtils.getChunkKey(chunkX, chunkZ));
+ if (playerChunk != null) {
+ ChunkStatus holderStatus = playerChunk.getChunkHolderStatus();
+ ChunkAccess immediate = playerChunk.getAvailableChunkNow();
+ if (immediate != null) {
+ if (allowSubTicketLevel ? immediate.getStatus().isOrAfter(status) : (playerChunk.getTicketLevel() <= chunkStatusTicketLevel && holderStatus != null && holderStatus.isOrAfter(status))) {
+ this.chunkLoadAccept(chunkX, chunkZ, immediate, onLoad);
+ return;
+ } else {
+ if (gen || (!allowSubTicketLevel && immediate.getStatus().isOrAfter(status))) {
+ this.getChunkAtAsynchronously(chunkX, chunkZ, chunkStatusTicketLevel, onLoad);
+ return;
+ } else {
+ this.chunkLoadAccept(chunkX, chunkZ, null, onLoad);
+ return;
+ }
+ }
+ }
+ }
+
+ // need to fire async
+
+ if (gen && !allowSubTicketLevel) {
+ this.getChunkAtAsynchronously(chunkX, chunkZ, chunkStatusTicketLevel, onLoad);
+ return;
+ }
+
+ this.getChunkAtAsynchronously(chunkX, chunkZ, io.papermc.paper.util.MCUtil.getTicketLevelFor(ChunkStatus.EMPTY), (ChunkAccess chunk) -> {
+ if (chunk == null) {
+ throw new IllegalStateException("Chunk cannot be null");
+ }
+
+ if (!chunk.getStatus().isOrAfter(status)) {
+ if (gen) {
+ this.getChunkAtAsynchronously(chunkX, chunkZ, chunkStatusTicketLevel, onLoad);
+ return;
+ } else {
+ ServerChunkCache.this.chunkLoadAccept(chunkX, chunkZ, null, onLoad);
+ return;
+ }
+ } else {
+ if (allowSubTicketLevel) {
+ ServerChunkCache.this.chunkLoadAccept(chunkX, chunkZ, chunk, onLoad);
+ return;
+ } else {
+ this.getChunkAtAsynchronously(chunkX, chunkZ, chunkStatusTicketLevel, onLoad);
+ return;
+ }
+ }
+ });
+ }
+ // Paper end
+
+ // Paper start
+ @Nullable
+ public ChunkAccess getChunkAtImmediately(int x, int z) {
+ ChunkHolder holder = this.chunkMap.getVisibleChunkIfPresent(ChunkPos.asLong(x, z));
@@ -6868,34 +6758,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ return holder.getLastAvailable();
+ }
+
+ // this will try to avoid chunk neighbours for lighting
+ public final ChunkAccess getFullStatusChunkAt(int chunkX, int chunkZ) {
+ LevelChunk ifLoaded = this.getChunkAtIfLoadedImmediately(chunkX, chunkZ);
+ if (ifLoaded != null) {
+ return ifLoaded;
+ }
+
+ ChunkAccess empty = this.getChunk(chunkX, chunkZ, ChunkStatus.EMPTY, true);
+ if (empty != null && empty.getStatus().isOrAfter(ChunkStatus.FULL)) {
+ return empty;
+ }
+ return this.getChunk(chunkX, chunkZ, ChunkStatus.FULL, true);
+ }
+
+ public final ChunkAccess getFullStatusChunkAtIfLoaded(int chunkX, int chunkZ) {
+ LevelChunk ifLoaded = this.getChunkAtIfLoadedImmediately(chunkX, chunkZ);
+ if (ifLoaded != null) {
+ return ifLoaded;
+ }
+
+ ChunkAccess ret = this.getChunkAtImmediately(chunkX, chunkZ);
+ if (ret != null && ret.getStatus().isOrAfter(ChunkStatus.FULL)) {
+ return ret;
+ } else {
+ return null;
+ }
+ }
+
+ public <T> void addTicketAtLevel(TicketType<T> ticketType, ChunkPos chunkPos, int ticketLevel, T identifier) {
+ this.distanceManager.addTicket(ticketType, chunkPos, ticketLevel, identifier);
+ }
@@ -6904,17 +6766,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ this.distanceManager.removeTicket(ticketType, chunkPos, ticketLevel, identifier);
+ }
+
+ public final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<LevelChunk> tickingChunks = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(4096, 0.75f, 4096, 0.15, true);
+ public final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<LevelChunk> entityTickingChunks = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(4096, 0.75f, 4096, 0.15, true);
+ // Paper end
public ServerChunkCache(ServerLevel world, LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, StructureTemplateManager structureTemplateManager, Executor workerExecutor, ChunkGenerator chunkGenerator, int viewDistance, int simulationDistance, boolean dsync, ChunkProgressListener worldGenerationProgressListener, ChunkStatusUpdateListener chunkStatusChangeListener, Supplier<DimensionDataStorage> persistentStateManagerFactory) {
this.level = world;
@@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
this.lastChunk[0] = chunk;
}
+ // Paper start - "real" get chunk if loaded
+ // "real" get chunk if loaded
+ // Note: Partially copied from the getChunkAt method below
+ @Nullable
+ public LevelChunk getChunkAtIfCachedImmediately(int x, int z) {
@@ -6956,10 +6808,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ return ret;
+ }
+ // Paper end
+
@Nullable
@Override
public ChunkAccess getChunk(int x, int z, ChunkStatus leastStatus, boolean create) {
public ThreadedLevelLightEngine getLightEngine() {
@@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
return this.mainThreadProcessor.pollTask();
}
- boolean runDistanceManagerUpdates() {
+ public boolean runDistanceManagerUpdates() { // Paper - public
boolean flag = this.distanceManager.runAllUpdates(this.chunkMap);
boolean flag1 = this.chunkMap.promoteChunkMap();
@@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
}
}
@@ -7020,7 +6880,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ return;
+ }
+ List<net.minecraft.world.level.chunk.ChunkAccess> ret = new java.util.ArrayList<>();
+ IntArrayList ticketLevels = new IntArrayList();
+ it.unimi.dsi.fastutil.ints.IntArrayList ticketLevels = new it.unimi.dsi.fastutil.ints.IntArrayList();
+
+ int minBlockX = Mth.floor(axisalignedbb.minX - 1.0E-7D) - 3;
+ int maxBlockX = Mth.floor(axisalignedbb.maxX + 1.0E-7D) + 3;
@@ -7876,6 +7736,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
if (!this.addEntityUuid(entity)) {
return false;
} else {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -0,0 +0,0 @@ public final class CraftServer implements Server {
return this.spigot;
}
// Spigot end
+
+ @Override
+ public double[] getTPS() {
+ return new double[]{0, 0, 0}; // TODO
+ }
}
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -7931,6 +7805,29 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+
+ return ret;
+ }
+
+ @Override
+ public void setViewDistance(final int viewDistance) {
+ if (viewDistance < 2 || viewDistance > 32) {
+ throw new IllegalArgumentException("View distance " + viewDistance + " is out of range of [2, 32]");
+ }
+ this.getHandle().chunkSource.chunkMap.setServerViewDistance(viewDistance);
+ }
+
+ @Override
+ public void setSimulationDistance(final int simulationDistance) {
+ throw new UnsupportedOperationException("Not implemented yet");
+ }
+
+ @Override
+ public int getSendViewDistance() {
+ return this.getViewDistance();
+ }
+
+ @Override
+ public void setSendViewDistance(final int viewDistance) {
+ throw new UnsupportedOperationException("Not implemented yet");
+ }
+ // Paper end
}
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -7975,6 +7872,45 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+ // Paper end
}
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -0,0 +0,0 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
return this.spigot;
}
// Spigot end
+
+ @Override
+ public int getViewDistance() {
+ return io.papermc.paper.chunk.system.ChunkSystem.getLoadViewDistance(this.getHandle());
+ }
+
+ @Override
+ public void setViewDistance(final int viewDistance) {
+ throw new UnsupportedOperationException("Not implemented yet");
+ }
+
+ @Override
+ public int getSimulationDistance() {
+ return io.papermc.paper.chunk.system.ChunkSystem.getTickViewDistance(this.getHandle());
+ }
+
+ @Override
+ public void setSimulationDistance(final int simulationDistance) {
+ throw new UnsupportedOperationException("Not implemented yet");
+ }
+
+ @Override
+ public int getSendViewDistance() {
+ return io.papermc.paper.chunk.system.ChunkSystem.getSendViewDistance(this.getHandle());
+ }
+
+ @Override
+ public void setSendViewDistance(final int viewDistance) {
+ throw new UnsupportedOperationException("Not implemented yet");
+ }
}
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java